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  <title>布局综合练习</title>
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    <div class="content floatclear">
      <div class="left floatleft">
        <div class="top floatclear">
          <div class="item1 floatleft">栏目一</div>
          <div class="item1 floatleft">栏目二</div>
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        <div class="buttom floatclear">
          <div class="item2 floatleft">栏目三</div>
          <div class="item2 floatleft">栏目四</div>
          <div class="item2 floatleft">栏目五</div>
          <div class="item2 floatleft">栏目六</div>
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      <div class="right floatright">
        <div class="item3">栏目七</div>
        <div class="item3">栏目八</div>
        <div class="item3">栏目九</div>
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    <div class="down">页脚</div>
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